[jules_1972]

If sag is good with your weight then spring is fine, less oil will reduce harshness from the hydraulic dampening.

 

[jules_1972]

You can reduce the stiffness of this air spring by decreasing the volume of hydraulic fluid that in turn increases the volume of air in the fork tube. (see figure) The fork manufacturer specifies the hydraulic fluid volume that they feels gives the desired air spring behavior.
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Bizarre......